US4276238A - Carburetor with automatic choking and acceleration device - Google Patents

Carburetor with automatic choking and acceleration device Download PDF

Info

Publication number
US4276238A
US4276238A US06/084,156 US8415679A US4276238A US 4276238 A US4276238 A US 4276238A US 8415679 A US8415679 A US 8415679A US 4276238 A US4276238 A US 4276238A
Authority
US
United States
Prior art keywords
fuel
piston
throttle valve
vacuum
engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/084,156
Other languages
English (en)
Inventor
Katsushi Yoshikawa
Masaaki Saito
Tadaki Ota
Mitsumasa Inoue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP12885378A external-priority patent/JPS5554654A/ja
Priority claimed from JP14556978U external-priority patent/JPS5562834U/ja
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Application granted granted Critical
Publication of US4276238A publication Critical patent/US4276238A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/04—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling being auxiliary carburetting apparatus able to be put into, and out of, operation, e.g. having automatically-operated disc valves
    • F02M1/046—Auxiliary carburetting apparatus controlled by piston valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M17/00—Carburettors having pertinent characteristics not provided for in, or of interest apart from, the apparatus of preceding main groups F02M1/00 - F02M15/00
    • F02M17/08—Carburettors having one or more fuel passages opening in a valve-seat surrounding combustion-air passage, the valve being opened by passing air
    • F02M17/09—Carburettors having one or more fuel passages opening in a valve-seat surrounding combustion-air passage, the valve being opened by passing air the valve being of an eccentrically mounted butterfly type

Definitions

  • the present invention relates to an improvement in automatic choking of a variable venturi carburetor in which the effective cross-sectional area of a venturi portion is varied in correspondence to the quantity of air sucked in.
  • variable venturi carburetor such as a so-called SU carburetor
  • a variable venturi portion is provided upstream of a throttle valve, and the venturi is driven by a vacuum-responsive device so that its degree of opening is controlled by a feedback system, so as to maintain the vacuum value between the variable venturi and the throttle valve substantially constant.
  • the effective area of the fuel nozzle which supplies fuel to the venturi portion should also be increased, so as to control the fuel flow rate to be proportional to the air flow rate and to control the air/fuel ratio to be always constant.
  • This type of carburetor has good stability performance, and particulates and atomizes the fuel well.
  • variable venturi carburetor in which the control of the quantity and the air/fuel ratio of the air/fuel mixture which is provided for starting and warming up of the engine is automatically provided by an automatic choking device of a simple and compact structure.
  • a carburetor comprising: a mixture passage; a throttle valve positioned in the mixture passage; a variable venturi valve positioned in the mixture passage upstream of the throttle valve; a vacuum-driven actuator which is controlled by the vacuum in the mixture passage between the throttle valve and the variable venturi valve, and which controls the opening of the variable venturi valve so as to keep said vacuum approximately constant; a variable fuel supplier, which is controlled according to the amount of opening of said variable venturi valve, so as to increase its fuel flow rate approximately in direct proportion to the said amount of opening, and which supplies fuel into the mixture passage; a bypass passage which bypasses the throttle valve in the mixture passage, leading from the upstream of the throttle valve to the downstream of the throttle valve; a piston, which is biased in a first direction by a spring, and which is urged in the direction opposite to said first direction by the vacuum downstream of the throttle valve, and whose motion in the said opposite direction progressively intercepts the bypass passage, so that by its reaching an equilibrium position determined by the balance
  • FIG. 1 is vertical section of a first embodiment of the present invention
  • FIG. 2 is an enlarged view of the right part of a piston and controlling members shown in FIG. 1;
  • FIG. 3 is a view of the left part of the piston and members, similar to FIG. 2;
  • FIG. 4 is an enlarged view of the piston and controlling members, in the downward position
  • FIG. 5 is a section taken along the line V--V in FIG. 5;
  • FIG. 6 is a vertical section of a second embodiment of the present invention.
  • FIG. 7 is a vertical section of the auxiliary fuel supply device of the carburetor shown in FIG. 6;
  • FIG. 8 is a vertical section taken along the line A--A of FIG. 7;
  • FIGS. 9 and 10 are graphs illustrating performances of choking fuel supply and choking air supply systems of this second embodiment.
  • FIG. 1 illustrates a first embodiment of the present invention, as applied to an air-valve type variable venturi carburetor of relatively simple structure.
  • the present invention however could be applied to other types of variable venturi carburetors.
  • a throttle valve 1 in a mixture passage which is not designated by any reference numeral is placed a throttle valve 1, and upstream of this throttle valve 1 is placed an air valve 3 which is controlled by a diaphragm means, or vacuum-driven actuator, 2.
  • This diaphragm means 2 is supplied with vacuum Po between the air valve 3 and the throttle valve 1, and maintains this vacuum substantially constant in a per se known way, by feedback.
  • a fuel nozzle 4 into which is inserted a jet needle 5 of tapered form.
  • the taper of the jet needle 5 co-operates with a fuel jet portion 11 of the nozzle 4 to meter the quantity of fuel passed therethrough, and the needle 5 is pulled in and out of the nozzle 4 by the bracket 9 which is linked to the air valve 3.
  • the vacuum Po is supplied to the diaphragm means 2 through a passage 6.
  • the taper of the needle 5 is so arranged that in a per se well known way the mixture supplied by the carburetor is kept of a constant air/fuel ratio, whatever may be the amount of opening of the throttle valve 1 and air valve 3.
  • An air bleed passage 10 is provided to bleed air in to be mixed with the fuel in the fuel nozzle 4 before it is ejected, so as to aid the particulation thereof.
  • a bypass passage 15-16 is provided which bypasses the throttle valve 1, leading from its upstream side to its downstream side.
  • This passage passes through the interior of a cylinder 17, within which moves a piston 18, in such a fashion that it can move from a pisition to the upper direction in the figure where it does not substantially interfere with the opening of the passage 15-16, (FIG. 1), to a position in the lower direction in the figure where it substantially closes the passage 15-16, via intermediate positions which partially close the passage 15-16.
  • the piston 18 is biased upward in the figure by a spring 20 and is urged downward in the figure by the vacuum Pb downstream of the throttle valve.
  • a heat-sensitive element which in this embodiment is a wax pellet 19 of a well-known per se sort (although in other possible embodiments other heat-sensitive means such as bimetals, etc. could be used), is arranged to limit the upper end of the range of movement of the piston 18, according to the temperature of the engine, or of the carburetor, which is representative of the engine temperature which is communicated to the wax pellet by conduction and/or convection.
  • a heater of a per se well known sort to heat this wax pellet directly.
  • the upper limit of the piston motion is as shown in the drawing, where it does not substantially interfere with the opening of the passage 15-16; but, as the engine warms up, this upper limit is gradually brought down, until when the engine is fully warm the piston is constrained to be in its lowermost position where it substantially completely blocks the passage 15-16.
  • the throttle bypass for choked running is provided.
  • the air/fuel mixture for choked running is provided through the usual running aperture between the needle 5 and the fuel jet portion 11, and through the air bleed 10. It is regulated as follows.
  • controlling members 30, 31 biased by leaf springs 32, 33 having U-shaped grooves, each of them having one tapered leg, 25a, 26a, as best seen in FIGS. 2, 3, 4, and 5.
  • These grooves 25 and 26 co-operate respectively with conduits 21 and 22, and with conduits 23 and 24, all of which are formed through the wall of the cylinder 17 to open on its inside.
  • FIGS. 2 and 3 show the state with the piston 18 at the top of its travel.
  • the flow resistance between conduits 23 and 24 is maximum, (substantially, in the present embodiment, the communication therebetween is interrupted), and the flow resistance between conduits 21 and 22 is minimum.
  • the flow resistance between conduits 23 and 24 decreases, until when the piston 18 is at the bottom of its stroke it is minimum (see FIG. 4) and simultaneously the flow resistance between conduits 21 and 22 increases, until when the piston 18 is at the bottom of its stroke it is maximum (in the present embodiment, the communication between conduits 21 and 22 is substantially interrupted at this point).
  • conduits 22 and 24 open to atmosphere, and the conduit 21 opens to the passage 6, and the conduit 23 to air bleed 10.
  • air/fuel mixture is allowed to pass through the passage 15-16, and this air/fuel mixture is created by a low air supply which is performed by the air bleed 10, because no air is allowed to pass by the conduits 23 and 24, and by a large amount of fuel sucked from the nozzle 4 by a relatively high vacuum Po provided between the throttle valve 1 and the air valve 3, due to the fact that the operational performance of the diaphragm means 2 to open the air valve 3 is substantially reduced, because of the admixture of atmospheric air through the conduits 21, 22 to the passage 6 to mix with the vacuum which controlls the diaphragm means 2 and dilute it. Therefore this air/fuel mixture is very rich, as is required during cranking of the engine.
  • a carburetor in which during cold starting the amount of bypass opening and the amount of starting mixture are increased, while the richness of this mixture is much increased, by the amount of air introduced therein being reduced, while the amount of fuel introduced therein is increased; and as soon as the engine has started and before it is warmed up, and during the warming-up process, appropriate amounts of choking mixture of the appropriate air/fuel ratio are constantly provided. Further, during sudden acceleration during warming-up, mixture is suddenly richened, so as to provide the function of the old-style "accelerator pump". All this is done by a single simple device of robust and cheap structure, and which possesses inherent reliability, which can simultaneously effect mixture supply control and air/fuel ratio control.
  • FIGS. 6-10 show a second embodiment of the present invention, in which the choking fuel supply is not metered by the needle, but is independently controlled by another heat-sensitive element.
  • a throttle valve 101 In a mixture passage which is not designated by any reference numeral is placed a throttle valve 101, and upstream of this throttle valve 101 is placed an air valve 102, which is controlled by a diaphragm means, or vacuum-driven actuator, which is not shown in the figures, in a manner which is per se well known.
  • This diaphragm means is supplied with vacuum Po from between the air valve 102 and the throttle valve 101, and maintains this vacuum substantially constant in a per se well known way, by feedback.
  • a fuel nozzle 107 into which is inserted a jet needle 111 of tapered form.
  • the taper of the jet needle 111 co-operates with a fuel jet portion 108 of the nozzle 107 so as to meter the quantity of fuel passed therethrough, and the needle 111 is pulled in and out of the nozzle 107 by the bracket 110 which is linked to the air valve 102.
  • the taper of the needle 111 is so arranged that in a per se well known way the mixture supplied by the carburetor is kept of a constant air/fuel ratio, whatever may be the amount of opening of the throttle valve 101 and air valve 102.
  • An air bleed passage 109 is provided to bleed air in to be mixed with the fuel before it is ejected, so as to aid in the particulation thereof.
  • a bypass passage 112-113 is provided which bypasses the throttle valve 101, leading from its upstream side to its downstream side.
  • This passage passes through the interior of a cylinder 160, within which moves a piston 161, in such a fashion that it can move from a position to the right direction in the figure where it does not substantially interfere with the opening 160A of the passage 112-113, to a position in the left direction in the figure where it substantially closes the opening 160A of the passage 112-113.
  • the piston 161 is biased by a spring 162 and is urged in the other direction by the vacuum Pb downstream of the throttle valve.
  • a heat-sensitive element which in this embodiment is a wax pellet 163 of a per se well known sort, (although in other embodiments other heat-sensitive means such as bimetals, etc., could be used) is arranged to limit the right hand end of the range of movement of the piston 161, according to the temperature of the engine, or of the carburetor, which is representative of the engine temperature, which is communicated to the wax pellet by conduction and/or convection.
  • a heater of a per se well known sort to heat this wax pellet directly.
  • the right hand end limit of the piston motion is as shown in the drawings, where it does not substantially interfere with the opening of the passage 112-113; but, as the engine warms up, this limit is gradually brought leftwards, until when the engine is fully warm the piston is constrained to be in its leftmost position where it substantially completely blocks the opening 160A of the passage 112-113.
  • This piston device in itself is similar to the piston device of the first embodiment. However, the flow of choking fuel, and the flow of choking air, are not controlled directly also by this piston, as in the first embodiment, but are independently controlled in a manner that will now be explained.
  • auxiliary fuel supply device 104 On the outer wall of the carburetor is attached the auxiliary fuel supply device 104. As illustrated in the drawings, this device 104 is installed in parallel with, and independently of, the main fuel supply path 105.
  • the air/fuel mixture supply path 106 leading from the auxiliary fuel supply device 104 is connected below the metering jet portion 108 of the fuel nozzle 107, so that mixture supplied thereby is not controlled by the needle 111.
  • the device 104 can be seen in more detail in FIGS. 7 and 8.
  • the mixture supply path 106 leads, via a jet orifice 151, which regulates the maximum flow rate during cranking of the engine, to the mixing plenum 149.
  • To this mixing plenum 149 are supplied fuel, through a starting fuel control system 121, and air, through a variable air bleed system 122, and through a fixed air bleed 123.
  • the fixed air bleed 123 is arranged to give the basic flow rate of air for starting the engine, by mixing air into the starting or cranking fuel supply so as to emulsify it.
  • the starting fuel control system 121 comprises a tubular guide member 131 set in the housing 127 of the device 104, and a plunger 129 which slides in this guide member 131 and whose left hand portion in the figure is formed as a tapered needle 133 which cooperates with the constricted end 134 of the guide member 131 to form a metering jet orifice 135 of variable cross-sectional area.
  • Fuel is introduced into the chamber 136 between the needle 133 and the member 131 through a fuel path 137, and passes past this metering jet orifice 135 to the mixing plenum 149.
  • the plunger 129 is biased in the rightward direction in the figure by a spring 132, and its end abuts on a temperature-sensitive bimetallic element 124 which responds to the temperature generated by a heater 125 and to the engine temperature, and which is disposed in a closed box behind the housing 127.
  • a temperature-sensitive bimetallic element 124 which responds to the temperature generated by a heater 125 and to the engine temperature, and which is disposed in a closed box behind the housing 127.
  • the upper end 124b of the bimetallic element 124 moves rightwards in the figure, and, as temperature increases, the upper end 124b of the bimetallic element 124 moves leftwards in the figure, so as gradually to press the plunger 129 leftwards in the figure, against the biasing action of the spring 132.
  • the orifice 135 is open to a maximum, and as the temperature of the bimetallic element 124 increases this orifice 135 becomes smaller, until the engine reaches operating temperature, when the orifice
  • the variable air bleed system 122 comprises a tubular guide member 138 set in the housing 127, and a plunger 139 which slides in this guide member 138, whose left hand end in the figure is formed as a tapered needle 142 which forms in co-operation with the constricted left hand end 143 of the guide member 138 a jet orifice 144 of variable cross-section. Air flows into the chamber between the guide member 138 and the needle 142 through an air conduit 147 and flows out through the orifice 144 into the plenum 149, its flow amount being regulated by the size of the orifice 144.
  • the right hand end in the figure of the guide member 138 is blocked by a plug 141, and between the plug 141 and the plunger 139 is a spring 140 which biases the plunger 139 in the leftwards direction in the figure.
  • the plunger 139 is urged in the rightwards direction in the figure by vacuum Pb obtained from below the throttle valve 101, through a conduit 170, a conduit 146, into the chamber 145 formed between the right hand end of the plunger 139 and the plug 141.
  • vacuum Pb obtained from below the throttle valve 101
  • the plunger 139 finds its position, and the size of the orifice 144 is controlled.
  • the tapering angle of this needle 142 is sharper and shorter than that of the needle 133 of the fuel system 121, so that the area of the jet orifice 144 changes abruptly, as the needle 142 moves.
  • This carburetor operates as follows.
  • the vacuum Pb below the throttle valve is zero or extremely low, and therefore the needle 142 is to the left in the figures, and the orifice 144 is substantially closed, and so supplies no air to the plenum 149, which therefore receives air only from the air bleed 123.
  • the bimetal 124 is cold, or at least not warm, and therefore the needle 133 is to the right in the figure, and the orifice 135 is open to a considerable extent, and thus a large amount of choking fuel is provided. Therefore, a rather rich mixture is supplied for cranking. It is particularly to be noted that the richness of this mixture depends upon the temperature of the engine during cranking, since this affects the position of the bimetal 124.
  • the piston device 114 controls the amount of opening of the passage 112-113 according to the temperature of the thermowax element 163. Since the functioning of the piston device 114 is exactly the same as in the first embodiment, no further explanation will be given here, for the purposes of simplicity of explanation and description.
  • FIG. 10 shows variation of A/F with Pb.
  • FIG. 9 shows the correlation of the bimetal temperature with the fuel flow rate.
  • the air/fuel ratio can be abruptly changed within the range of the vacuum Pb.
  • the vacuum Pb becomes approximately-150 mmHg
  • the chamber 145 is reduced substantially to zero size, and the aperture of the orifice 144 becomes maximum. If the vacuum Pb is therefore further increased, the air/fuel ratio does not change, as long as the fuel flow rate does not change.
  • a PTC heater for maintaining a predetermined temperature can be conveniently used, in which the resistance increases to reduce the electric current when the temperature is exceeded.
  • the bimetal 124 may be replaced with a per se well known thermowax pellet or the like, with an equivalent effect.
  • the device of the present invention requires no large size components such as the conventional automatic choke valve mechanism or ignition diaphragm mechanism. It is particularly suited for a variable venturi carburetor, which is not well adapted to attachment of a conventional choke valve mechanism. Also the components of the present invention are simple and cheap elements. Thus a carburetor according to the present invention is cheap and easy to make and simple to service. Also the functions both of an automatic choke and of an accelerator pump during warming up of the engine are provided by a simple and ingenious mechanism.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
US06/084,156 1978-10-19 1979-10-12 Carburetor with automatic choking and acceleration device Expired - Lifetime US4276238A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP53-128853 1978-10-19
JP12885378A JPS5554654A (en) 1978-10-19 1978-10-19 Variable venturi carburetor
JP14556978U JPS5562834U (de) 1978-10-23 1978-10-23
JP53-145569[U] 1978-10-23

Publications (1)

Publication Number Publication Date
US4276238A true US4276238A (en) 1981-06-30

Family

ID=26464426

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/084,156 Expired - Lifetime US4276238A (en) 1978-10-19 1979-10-12 Carburetor with automatic choking and acceleration device

Country Status (3)

Country Link
US (1) US4276238A (de)
DE (1) DE2942377C2 (de)
GB (1) GB2033481B (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4341723A (en) * 1980-08-26 1982-07-27 Hidenori Hirosawa Variable venturi carburetor
US4371478A (en) * 1980-07-22 1983-02-01 Aisan Kogyo Kabushiki Kaisha Variable venturi carburetor
US4450117A (en) * 1981-12-21 1984-05-22 Toyota Jidosha Kabushiki Kaisha Variable venturi-type carburetor
US4452190A (en) * 1981-03-27 1984-06-05 Ross Gray E D Cold start fuel/air mixture supply device for spark ignition internal combustion engines
US4460518A (en) * 1981-12-22 1984-07-17 Toyota Jidosha Kabushiki Kaisha Device for controlling the operation of a carburetor
US4472326A (en) * 1981-12-21 1984-09-18 Toyota Jidosha Kabushiki Kaisha Variable venturi-type carburetor
US4477392A (en) * 1981-12-21 1984-10-16 Toyota Jidosha Kabushiki Kaisha Variable venturi-type carburetor
US4491550A (en) * 1982-02-05 1985-01-01 Toyota Jidosha Kogyo Kabushiki Kaisha Variable venturi type carburetor
US4946631A (en) * 1988-12-06 1990-08-07 Crown Carburetor Co., Ltd. Carburetor
US6000369A (en) * 1996-10-03 1999-12-14 U.S.A. Zama, Inc. Starting system for diaphragm carburetor
FR2803882A1 (fr) * 2000-01-17 2001-07-20 Honda Motor Co Ltd Systeme de moteur hors bord
US7287743B1 (en) * 2005-03-08 2007-10-30 Walbro Engine Management, L.L.C. Carburetor with an air bleed passage
US20090044777A1 (en) * 2007-08-13 2009-02-19 Briggs & Stratton Corporation Automatic choke for an engine
US20120197514A1 (en) * 2011-01-27 2012-08-02 Honda Motor Co., Ltd. Engine control device and cogeneration apparatus employing the engine control device

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3278173A (en) * 1963-04-29 1966-10-11 Acf Ind Inc Carburetor
US3493217A (en) * 1966-12-16 1970-02-03 John Dashwood Farley Carburettors
US3670709A (en) * 1970-05-25 1972-06-20 Gen Motors Corp Idle air control
US3764120A (en) * 1970-10-09 1973-10-09 Honda Motor Co Ltd Air bleed adjusting device for the carburetor of an internal combustion engine
US3885545A (en) * 1973-07-02 1975-05-27 Ford Motor Co Carburetor cold enrichment device
US3897765A (en) * 1974-01-04 1975-08-05 Ford Motor Co Carburetor cranking fuel flow rate control
US3917760A (en) * 1974-01-25 1975-11-04 British Leyland Austin Morris Carburetters fitted to internal combustion engines
US3967610A (en) * 1973-09-12 1976-07-06 The Zenith Carburetor Company Limited Cold starting devices
US4102315A (en) * 1977-01-14 1978-07-25 The Bendix Corporation Proportional controller for controlling air flow to an engine
US4180533A (en) * 1977-02-08 1979-12-25 Societe Industrielle De Brevets Et D'etudes S.I.B.E. Carburetor for internal combustion engines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3243167A (en) * 1962-06-04 1966-03-29 Bendix Corp Constant vacuum type carburetor

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3278173A (en) * 1963-04-29 1966-10-11 Acf Ind Inc Carburetor
US3493217A (en) * 1966-12-16 1970-02-03 John Dashwood Farley Carburettors
US3670709A (en) * 1970-05-25 1972-06-20 Gen Motors Corp Idle air control
US3764120A (en) * 1970-10-09 1973-10-09 Honda Motor Co Ltd Air bleed adjusting device for the carburetor of an internal combustion engine
US3885545A (en) * 1973-07-02 1975-05-27 Ford Motor Co Carburetor cold enrichment device
US3967610A (en) * 1973-09-12 1976-07-06 The Zenith Carburetor Company Limited Cold starting devices
US3897765A (en) * 1974-01-04 1975-08-05 Ford Motor Co Carburetor cranking fuel flow rate control
US3917760A (en) * 1974-01-25 1975-11-04 British Leyland Austin Morris Carburetters fitted to internal combustion engines
US4102315A (en) * 1977-01-14 1978-07-25 The Bendix Corporation Proportional controller for controlling air flow to an engine
US4180533A (en) * 1977-02-08 1979-12-25 Societe Industrielle De Brevets Et D'etudes S.I.B.E. Carburetor for internal combustion engines

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4371478A (en) * 1980-07-22 1983-02-01 Aisan Kogyo Kabushiki Kaisha Variable venturi carburetor
US4341723A (en) * 1980-08-26 1982-07-27 Hidenori Hirosawa Variable venturi carburetor
US4452190A (en) * 1981-03-27 1984-06-05 Ross Gray E D Cold start fuel/air mixture supply device for spark ignition internal combustion engines
US4450117A (en) * 1981-12-21 1984-05-22 Toyota Jidosha Kabushiki Kaisha Variable venturi-type carburetor
US4472326A (en) * 1981-12-21 1984-09-18 Toyota Jidosha Kabushiki Kaisha Variable venturi-type carburetor
US4477392A (en) * 1981-12-21 1984-10-16 Toyota Jidosha Kabushiki Kaisha Variable venturi-type carburetor
US4460518A (en) * 1981-12-22 1984-07-17 Toyota Jidosha Kabushiki Kaisha Device for controlling the operation of a carburetor
US4491550A (en) * 1982-02-05 1985-01-01 Toyota Jidosha Kogyo Kabushiki Kaisha Variable venturi type carburetor
US4946631A (en) * 1988-12-06 1990-08-07 Crown Carburetor Co., Ltd. Carburetor
US6000369A (en) * 1996-10-03 1999-12-14 U.S.A. Zama, Inc. Starting system for diaphragm carburetor
FR2803882A1 (fr) * 2000-01-17 2001-07-20 Honda Motor Co Ltd Systeme de moteur hors bord
US6375526B2 (en) * 2000-01-17 2002-04-23 Honda Giken Kogyo Kabushiki Kaisha Outboard engine system
US7287743B1 (en) * 2005-03-08 2007-10-30 Walbro Engine Management, L.L.C. Carburetor with an air bleed passage
US20090044777A1 (en) * 2007-08-13 2009-02-19 Briggs & Stratton Corporation Automatic choke for an engine
US8146558B2 (en) 2007-08-13 2012-04-03 Briggs & Stratton Corporation Automatic choke for an engine
US20120197514A1 (en) * 2011-01-27 2012-08-02 Honda Motor Co., Ltd. Engine control device and cogeneration apparatus employing the engine control device
US9429086B2 (en) * 2011-01-27 2016-08-30 Honda Motor Co., Ltd. Engine control device and cogeneration apparatus employing the engine control device

Also Published As

Publication number Publication date
DE2942377C2 (de) 1984-02-16
GB2033481B (en) 1983-02-09
GB2033481A (en) 1980-05-21
DE2942377A1 (de) 1980-04-24

Similar Documents

Publication Publication Date Title
US4276238A (en) Carburetor with automatic choking and acceleration device
US3243167A (en) Constant vacuum type carburetor
US3957026A (en) Cold starting enrichment device
US4143631A (en) Apparatus for regulating the composition of the operating mixture of an internal combustion engine
US3885545A (en) Carburetor cold enrichment device
US3642256A (en) Fuel supply system
US4007721A (en) Fuel metering apparatus for a carburetor
US4053544A (en) Fuel induction system for internal combustion engines
US3956434A (en) Carburetor cold enrichment fuel metering signal and air flow modulator
US3956433A (en) Automatic device for equalizing the adjustment of the carburetter to the operation of an engine not yet running at a steady temperature
US2981245A (en) Carburetor idle fuel control means
US2986380A (en) Thermostatic idle
US3001774A (en) Carburetor
US3930479A (en) Fuel metering device for externally ignited internal combustion engines with compression of the air-fuel mixture
US4052488A (en) Supplying fuel to internal combustion engines
US4026259A (en) Fuel injection device for mixture-condensing, spark-ignited internal combustion engines
US3897765A (en) Carburetor cranking fuel flow rate control
US4090486A (en) Fuel injection system
US4434110A (en) Carburetor, control apparatus and method for internal combustion engines
US3476096A (en) Fuel supply system for internal combustion engines
EP1041266A2 (de) Steuervorrichtung für Drosselklappenbypassleitung
US4433662A (en) Fuel supply system
JPS5810576B2 (ja) 内燃機関のアイドル速度を制御する装置
US2968297A (en) Induction system
US2954018A (en) Cold start enrichment system

Legal Events

Date Code Title Description
STCF Information on status: patent grant

Free format text: PATENTED CASE